Primo D4

Common issues

• Impeller clogs with debris typical of bilge/drainage duty, reducing flow
• Mechanical seal wears and allows water into the motor housing
• Power cable or plug is damaged from repeated dragging across deck or through hatches
• Float switch, where fitted, sticks, causing the pump to run dry or fail to start
• Strainer/inlet screen blocks with debris, causing loss of prime or cavitation
• Pump overheats and trips if run dry for an extended period

Inspection checklist

• Visually inspect the power cable and plug for cuts, abrasion or water ingress before each deployment
• Perform an insulation resistance test on the motor before use, especially after storage
• Check the mechanical seal oil chamber for water contamination
• Inspect the impeller and wear plate for damage or wear
• Clean and inspect the strainer/inlet screen
• Test float switch operation, start/stop levels, if fitted
• Check the lifting handle and discharge hose coupling for security

Service intervals

Critical spares

• Mechanical seal kit
• O-ring and gasket set
• Impeller
• Cable gland/entry kit
• Strainer/inlet screen

Safety

• Electrical shock risk from a damaged cable or seal failure - always insulation-test before use and never bypass earth-leakage protection
• Pump and cable weight creates a manual handling hazard during deployment/recovery
• Entanglement risk from the submerged rotating impeller if hands are near the inlet while running
• Use only with a correctly rated, earth-leakage-protected supply or generator

Class survey

As a portable emergency drainage pump it is normally checked as part of the vessel's fire/damage control equipment inventory rather than as a classed fixed item; verify it is on the approved emergency equipment list with a current functional test record, unless it is designated as a fixed emergency bilge pump, in which case it falls under the bilge system survey.